THROTTLE POSITION SENSOR/ACCELERATOR PEDAL POSITION SENSOR 2, CHECKING
Special tools and workshop equipment required
- multimeter.
- Wiring diagram
Test requirement
- The Motronic Engine Control Module (ECM) - J623- fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
Note. Use only gold-plated terminals when servicing the electrical harness connector terminals in Throttle Position (TP) Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185-.
Test procedure
Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK
Start diagnosis
Remove the drivers side storage compartment. Refer to the appropriate service information.
Disconnect the Throttle Position (TP) Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185- 6 pin electrical harness connector -2-.
Scheme 78
Checking voltage supply and wiring
Switch the ignition on.
Using a multimeter, check the following wiring connections for voltage.
Scheme 79
| Throttle Position (TP) Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185- electrical harness connector terminals | Specified value |
|---|---|
| 1 to Ground (GND) | Near 5 V |
| 1 to 5 | Near 5 V |
| 2 to Ground (GND) | Near 5 V |
| 2 to 3 | Near 5 V |
Switch the ignition off.
If the specified value was Not obtained
If the manufacturers test box is being used, perform the following step.
Install the test box.
If the manufacturers test box is not being used, perform the following step.
Remove the Motronic Engine Control Module (ECM) -J623-. Refer to the appropriate service information.
Using a multimeter, check the Throttle Position (TP) Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J623- electrical connector T94 for an open circuit.
Scheme 80
| Throttle Position (TP) Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185- electrical harness connector terminals | Motronic Engine Control Module (ECM) -J623- electrical connector T94 terminals or test box sockets |
|---|---|
| 1 | 81 |
| 2 | 82 |
| 3 | 35 |
| 4 | 83 |
| 5 | 11 |
| 6 | 61 |
Specified value: 1.5 ohms max.
If the specified value was Not obtained
Check the wiring for a short circuit to each other, Battery (+), and Ground or high resistance).
Check the electrical harness connector for damage, corrosion, loose or broken terminals.
If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and the voltage supply was OK
Replace the Throttle Position (TP) Sensor -G79- /Accelerator Pedal Position Sensor 2 -G185-. Refer to the appropriate service information.
If no malfunction is detected in the wiring and the voltage supply was Not OK
Replace the Motronic Engine Control Module (ECM) -J623-. Refer to the appropriate service information.
Install the drivers side storage compartment. Refer to the appropriate service information.
Final procedures
After the repair work, the following work steps must be performed in the following sequence
- Check the DTC memory. Refer to «DIAGNOSTIC MODE 03 - READ DTC MEMORY»(ref-479546-S27711938632012061300000) .
- If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(ref-479546-S40908393152012061300000) .
- If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(ref-479546-S40511231242012061300000) .